radosgw/swift emulate split read/write acls?
With ceph radosgw/swift; setting just the read or write acl clears the other. Unless that behavior is specifically desired, it's currently necessary to set both "-r" and "-w" (on the swift command) at the same time. The swift documentation strongly suggests that is not the case with native swift.
ceph stores just one combined read/write acl, and if either of -r -w was specified, re-initializes this acl before applying the changes. We could emulate swift's behavior more closely by looking to to see if one of -r -w was not specified, and if so, filtering the appropriate bits of the old acl into the new acl.